Gene Regulation Welcome to your Gene regulation question series Helix-turn-helix Zinc finger Homeodomain Leucine zipper None Choose the correct sequence of the events as per the progression of the expression of the lac operon. A. Expression of I geneB. Expression of lac operonC. Binding of lactose to the repressorD.Binding of lac repressor to the operator of lac operon ABCD BCAD ADCB ADBC None What is true about isopropylthiogalactoside (IPTG) A lac operon inducer A substrate for β-galactosidase A repressor None of the above None Which of the following is not true about operon Genes are clustered on the chromosome May produce polycistronic RNAs Can be operated by a single promoter Each gene of the operon is regulated independent promoter None Which of the following amino acid is not synthesised by E. coli Cys Arg Pro His None None Where are the chemical groups located on the DNA that facilitate the binding of proteins Major groove Minor groove TAATAA box Any promoter None Where is the leader sequence is located in trp operon, 3’end of trp operon mRNA 5’ end of trp operon mRNA 800 bp downstream 5’UTR Ribosomal binding site of last gene None Which of the following is true for genes in the operon Each gene has an independent promoter Each gene has its own ribosome binding site All the genes need separate activation All of the above None Which of the following protein is most abundant in the biosphere? DNA repair proteins DNA polymerase Elongation factors 1,5 bisphosphate carboxylase/oxygenase None Which of the following is true about CRP-cAMP in lac operon regulation CRP-cAMP is a positive regulator of responsive to lactose CRP-cAMP is a negative regulator of responsive to lactose CRP-cAMP is a positive regulator of responsive to glucose I&III None Operator sequences are DNA polymerase binding site Transcription inducer proteins Repressor binding sites None of the above None In an attenuator sequence in trp operon sequence 3 has 2 and 4 as complement sequence True False None Time's up
